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vhangup(2) [bsd man page]

VHANGUP(2)							System Calls Manual							VHANGUP(2)

NAME
vhangup - virtually ``hangup'' the current control terminal SYNOPSIS
vhangup() DESCRIPTION
Vhangup is used by the initialization process init(8) (among others) to arrange that users are given "clean"' terminals at login, by revok- ing access of the previous users' processes to the terminal. To effect this, vhangup searches the system tables for references to the con- trol terminal of the invoking process, revoking access permissions on each instance of the terminal that it finds. Further attempts to access the terminal by the affected processes will yield i/o errors (EBADF). Finally, a hangup signal (SIGHUP) is sent to the process group of the control terminal. SEE ALSO
init (8) BUGS
Access to the control terminal via /dev/tty is still possible. This call should be replaced by an automatic mechanism that takes place on process exit. 4th Berkeley Distribution June 30, 1985 VHANGUP(2)

Check Out this Related Man Page

VHANGUP(2)						     Linux Programmer's Manual							VHANGUP(2)

NAME
vhangup - virtually hangup the current tty SYNOPSIS
#include <unistd.h> int vhangup(void); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): vhangup(): _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500) DESCRIPTION
vhangup() simulates a hangup on the current terminal. This call arranges for other users to have a "clean" tty at login time. RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately. ERRORS
EPERM The calling process has insufficient privilege to call vhangup(); the CAP_SYS_TTY_CONFIG capability is required. CONFORMING TO
This call is Linux-specific, and should not be used in programs intended to be portable. SEE ALSO
capabilities(7), init(8) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2007-07-26 VHANGUP(2)
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